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3-29 SERVICING ENGINE
CAMSHAFT
The camshaft
should be checked for runout and
also for wear of cams and journals if the engine
has
been
noted
to produce
abnormal
noise
or
vibration
or to lack output power. Any of these
malconditions could be caused by a worn camshaft.
CAMSHAFT
CAM WEAR
Worn-down
cams are often the cause of mistimed
valve operation resulting in reduced output power.
The limit of cam wear is specified for both intake
and
exhaust
cams
in terms
of cam
height @,
which
is to
be
measured
with
a
micrometer.
Replace the camshaft if found it worn down to the
limit.
Micrometer
09900-20:
kee
(25 — 50 mm)
Cam height
Height ©)
Service Limit
36.230 mm
Intake cam
(1.4264 in)
36.460 mm
(1.4354 in)
Exhaust cam
Inlet open
(B.T.D.C.)
Exhaust close
(A.T.D.C.)
Inlet close
(A.B.D.C.)
B.D.C.
Exhaust open
(B.B.D.C.)
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